First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments
Rakopoulos, V., Lantz, M., Solders, A., Al-Adili, A., Mattera, A., Canete, L., Eronen, T., Gorelov, D., Jokinen, A., Kankainen, A., Kolhinen, V., Moore, I., Nesterenko, D., Penttilä, H., Pohjalainen, I., Rinta-Antila, S., Simutkin, V., Vilén, M., Voss, A., & Pomp, S. (2018). First isomeric yield ratio measurements by direct ion counting and implications for the angular momentum of the primary fission fragments. Physical Review C, 98(2), Article 024612. https://doi.org/10.1103/physrevc.98.024612
Julkaistu sarjassa
Physical Review CTekijät
Päivämäärä
2018Tekijänoikeudet
© 2018 American Physical Society
We report the first experimental determination of independent isomeric yield ratios using direct ion counting with a Penning trap, which offered such a high resolution in mass that isomeric states could be separated. The measurements were performed at the Ion Guide Isotope Separator On-Line (IGISOL) facility at the University of Jyväskylä. The isomer production ratios of 81Ge, 96,97Y, 128,130Sn, and 129Sb in the 25-MeV proton-induced fission of natU and 232Th were studied. Three isomeric pairs (81Ge, 96Y, and 129Sb) were measured for the first time for the natU(p,f) reaction, while all the reported yield ratios for the 232Th(p,f) reaction were determined for the first time. The comparison of the experimentally determined isomeric yield ratios with data available in the literature shows a reasonable agreement, except for the case of 130Sn for unspecified reasons. The obtained results were also compared with the gef model, where good agreement can be noticed in most cases for both reactions. Serious discrepancies can only be observed for the cases of 96,97Y for both reactions. Moreover, based on the isomeric yield ratios, the root-mean-square angular momenta (Jrms) of the fission fragments after scission were estimated using the talys code. The experimentally determined isomeric yield ratios, and consequently the deduced Jrms, for 130Sn are significantly lower compared to 128Sn for both fissioning systems. This can be attributed to the more spherical shape of the fragments that contribute to the formation of 130Sn, due to their proximity to the N=82 shell closure. The values of Jrms for 129Sb are higher than 128Sn for both reactions, despite the same neutron number of both nuclides (N=78), indicating the odd-Z effect where fission fragments with odd-Z number tend to bear larger angular momentum than even-Z fragments. The isomer production ratio for the isotopes of Sn is more enhanced in the natU(p,f) reaction than in 232Th(p,f). The opposite is observed for 96Y and 97Y. These discrepancies might be associated to different scission shapes of the fragments for the two fission reactions, indicating the impact that the different fission modes can have on the isomeric yield ratios.
...
![showless](/themes/JYX2//images/showless.png)
![showmore](/themes/JYX2//images/showmore.png)
Julkaisija
American Physical SocietyISSN Hae Julkaisufoorumista
2469-9985Asiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/28213194
Metadata
Näytä kaikki kuvailutiedotKokoelmat
Rahoittaja(t)
Suomen AkatemiaRahoitusohjelmat(t)
Akatemiatutkijan tutkimuskulut, SA; Akatemiatutkija, SALisätietoja rahoituksesta
This work was supported by the European Commission within the Seventh Framework Programme through Fission-2013-CHANDA (Project No. 605203), the Swedish Radiation Safety Authority (SSM), the Swedish Nuclear Fuel and Waste Management Co. (SKB), and the Academy of Finland under the Finnish Centre of Excellence Programme 2012–2017 (Nuclear and Accelerator Based Physics Research at JYFL). A.K. acknowledges support from Academy of Finland under Projects No. 275389, No. 284516, and No. 312544. T.E. acknowledges support from Academy of Finland under Project No. 295207.![showless](/themes/JYX2//images/showless.png)
![showmore](/themes/JYX2//images/showmore.png)
Lisenssi
Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique
Rakopoulos, V.; Lantz, M.; Pomp, S.; Solders, A.; Al-Adili, A.; Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kankainen, Anu; Mattera, A.; Moore, Iain; Nesterenko, Dmitrii; Reponen, Mikael; Rinta-Antila, Sami; de Roubin, Antoine; Vilén, Markus; Österlund, M.; Penttilä, Heikki (American Physical Society, 2019)Isomeric yield ratios for the odd-A isotopes of 119–127Cd and 119–127In from 25-MeV proton-induced fission on natural uranium have been measured at the JYFLTRAP double Penning trap, by employing the phase-imaging ... -
Fission yield studies with SPIG-equipped IGISOL : a novel method for nuclear data measurements
Karvonen, Pasi (University of Jyväskylä, 2010)This thesis work consists of two sections. In the first section, the development of a so-called Laser Ion Source Trap (LIST) device is described. The LIST device is based on a double SPIG (SextuPole Ion Guide) system, ... -
New design and simulation of the ion guide for neutron-induced fission products at the IGISOL facility
Gao, Zhihao; Solders, Andreas; Al-Adili, Ali; Cannarozzo, Simone; Lantz, Mattias; Penttilä, Heikki; Pomp, Stephan (EDP Sciences, 2023)Measurements of independent fission yield distributions in neutron-induced fission at high neutron energies are important for our fundamental understanding of the fission process, and are also relevant for reactor physics ... -
Measurement of fission yields and isomeric yield ratios at IGISOL
Pomp, Stephan; Mattera, Andrea; Rakopoulos, Vasileios; Al-Adili, Ali; Lantz, Mattias; Solders, Andreas; Jansson, Kaj; Prokofiev, Alexander; Eronen, Tommi; Gorelov, Dmitry; Jokinen, Ari; Kankainen, Anu; Moore, Iain; Penttilä, Heikki; Rinta-Antila, Sami (EDP Sciences, 2018)Data on fission yields and isomeric yield ratios (IYR) are tools to study the fission process, in particular the generation of angular momentum. We use the IGISOL facility with the Penning trap JYFLTRAP in Jyväskylä, ... -
Measurements of isomeric yield ratios of fission products from proton-induced fission on natU and 232Th via direct ion counting
Rakopoulos, Vasileios; Lantz, Mattias; Al-Adili, Ali; Gorelov, Dmitry; Jokinen, Ari; Kolhinen, Veli; Mattera, Andrea; Moore, Iain; Penttilä, Heikki; Prokofiev, Alexander V.; Solders, Andreas; Pomp, Stephan (EDP Sciences, 2017)Independent isomeric yield ratios (IYR) of 81Ge, 96Y, 97Y, 97Nb, 128Sn and 130Sn have been determined in the 25 MeV proton-induced fission of natU and 232Th. The measurements were performed at the Ion Guide Isotope Separator ...
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.